Abstract
A novel tuning structure for the identical three-guide coupler is proposed to obtain high power transfer efficiency without waveguide bending. The basic principles of three-guide couplers with a symmetric tuning are analyzed by applying the exact slab theory. Based on numerical calculations, novel coupling characteristics of the tuning structure, compared with those of the identical three-guide coupler, are demonstrated, and their possible applications are discussed. © 1992 John Wiley & Sons, Inc.
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